static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
struct spi_master *master,
const struct resource *res)
{
int ret;
/* Prepare for TX DMA: */
master->dma_tx = dma_request_slave_channel(dev, "tx");
if (!master->dma_tx) {
dev_err(dev, "cannot get the TX DMA channel!\n");
ret = -EINVAL;
goto err;
}
spi_imx->tx_config.direction = DMA_MEM_TO_DEV;
spi_imx->tx_config.dst_addr = res->start + MXC_CSPITXDATA;
spi_imx->tx_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
spi_imx->tx_config.dst_maxburst = spi_imx_get_fifosize(spi_imx) / 4;
ret = dmaengine_slave_config(master->dma_tx, &spi_imx->tx_config);
if (ret) {
dev_err(dev, "error in TX dma configuration.\n");
goto err;
}
/* Prepare for RX : */
master->dma_rx = dma_request_slave_channel(dev, "rx");
if (!master->dma_rx) {
dev_dbg(dev, "cannot get the DMA channel.\n");
ret = -EINVAL;
goto err;
}
spi_imx->rx_config.direction = DMA_DEV_TO_MEM;
spi_imx->rx_config.src_addr = res->start + MXC_CSPIRXDATA;
spi_imx->rx_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
spi_imx->rx_config.src_maxburst = spi_imx_get_fifosize(spi_imx) / 2;
ret = dmaengine_slave_config(master->dma_rx, &spi_imx->rx_config);
if (ret) {
dev_err(dev, "error in RX dma configuration.\n");
goto err;
}
init_completion(&spi_imx->dma_rx_completion);
init_completion(&spi_imx->dma_tx_completion);
master->can_dma = spi_imx_can_dma;
master->max_dma_len = MAX_SDMA_BD_BYTES;
spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX |
SPI_MASTER_MUST_TX;
spi_imx->rx_wml = spi_imx->rx_config.src_maxburst;
spi_imx->tx_wml = spi_imx->tx_config.dst_maxburst;
spi_imx->dma_is_inited = 1;
return 0;
err:
spi_imx_sdma_exit(spi_imx);
return ret;
}
static int spi_imx_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
spi_bitbang_stop(&spi_imx->bitbang);
writel(0, spi_imx->base + MXC_CSPICTRL);
clk_unprepare(spi_imx->clk_ipg);
clk_unprepare(spi_imx->clk_per);
spi_imx_sdma_exit(spi_imx);
spi_master_put(master);
return 0;
}
static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
struct spi_master *master)
{
int ret;
/* use pio mode for i.mx6dl chip TKT238285 */
if (of_machine_is_compatible("fsl,imx6dl"))
return 0;
spi_imx->wml = spi_imx_get_fifosize(spi_imx) / 2;
/* Prepare for TX DMA: */
master->dma_tx = dma_request_slave_channel_reason(dev, "tx");
if (IS_ERR(master->dma_tx)) {
ret = PTR_ERR(master->dma_tx);
dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret);
master->dma_tx = NULL;
goto err;
}
/* Prepare for RX : */
master->dma_rx = dma_request_slave_channel_reason(dev, "rx");
if (IS_ERR(master->dma_rx)) {
ret = PTR_ERR(master->dma_rx);
dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret);
master->dma_rx = NULL;
goto err;
}
spi_imx_dma_configure(master, 1);
init_completion(&spi_imx->dma_rx_completion);
init_completion(&spi_imx->dma_tx_completion);
master->can_dma = spi_imx_can_dma;
master->max_dma_len = MAX_SDMA_BD_BYTES;
spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX |
SPI_MASTER_MUST_TX;
return 0;
err:
spi_imx_sdma_exit(spi_imx);
return ret;
}
